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An investigation to find out the effect of salt solution concentration on potato tissue.

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Introduction

An investigation to find out the effect of salt solution concentration on potato tissue. Name: Amandeep Ghuman Class: 11.2.B. Teacher: Mr.Edwards/Mrs.Kingwell Aim: I am trying to find out how different salt solution concentrations affect potato tissue. Input Variable: I am going to change the salt solution concentration. To create a fair test certain aspects of the experiment will have to be kept the same whilst one key variable is changed. I have chosen to vary the concentration of the salt solution. This will give me a varied set of results from which I hope to make a decent conclusion. If any of the non-variables are not kept constant it would mean it would not be a fair test. For instance if one of the potato chips was 1cm longer the surface area of the chip would be larger and there would therefore be more space for osmosis to occur. Doing all the tests at one temperature will control the temperature. For the purpose of my experiment I am going to do all the experiments at room temperature. The volume of the solution that the potato chips are kept in must be fair. The must be totally covered in the solution, and the amount of solution will be kept the same because all the potato chips are the same size. I am also going to use the same balance to weigh my potato chips. This is because the measurements may slightly vary between scales. ...read more.

Middle

I will also be washing all the equipment with water to protect any germs getting to any student. The potato is must clean equipment because the potato could be very dirty and very unhygienic, so the potato must be thoroughly washed before touching it. I had to ensure that every time I handled the potatoes my hands were clean and dry. This was to stop any kind of contamination and made sure that I did not pass on any extra water onto the potato. Whilst cutting the potato, extreme care and precision had to be taken with the cork borer and knife as it is very sharp and could easily cause a serious wound. Apparatus: -Test tube rack - Six test tubes - Cork Borer - Weighing Scale - Tile - Potatoes - Six potato chips - Measuring Cylinder - Salt Concentration - Stopwatch - Distilled water - Knife Main Practical: Results Table: Practical 1: Test Tube Salt Solution (M) Mass Before (g) Mass After (g) Time (Hours) 1 0 2.5 3.0 2:45 2 0.2 2.4 2.5 2:45 3 0.4 2.4 2.2 2:45 4 0.6 2.6 2.1 2:45 5 0.8 2.6 2.0 2:45 6 1 2.4 1.9 2:45 Practical 2: Test Tube Salt Solution (M) Mass Before (g) Mass After (g) Time (Hours) 1 0 2.5 3.0 2:50 2 0.2 2.5 2.6 2:50 3 0.4 2.5 2.1 2:50 4 0.6 2.4 1.8 2:50 5 0.8 2.4 1.7 2:50 6 1 2.4 1.6 2:50 Graph Analysis/Conclusion: The evidence obtained from this investigation supports the prediction I made. ...read more.

Conclusion

not to 0.00g but to 0.0000g. The procedure I followed turned out to be correct. My data had no errors and the experiments turned out to be a success. This was because I kept all the potato chips in their concentrations for about the same time length. Also I kept the mass of each potato chip roughly the same, and I kept them all in 20cm3 of solutions. For next time I could make it more accurate by measuring the length of the potato chips as well as the mass. I also could have extended the experiment by using more salt solution concentrations, for example I could have used 1.2, 1.4, 1.6, 1.8 and 2.0m salt solutions which would have produced more accurate results and would have varied my results more. There were not any out of the ordinary results, but some were not as close to the line as others. This may have been caused by human error. When the potato chips were removed from the test tubes and dried I may well have dried some potatoes more thoroughly than others and so some would have more excess water, which would add to the mass. If the experiment was repeated I would have found another way to dry the potatoes that would ensure that all were dried in the same way for the same time. I didn't find any anomalous results, so I didn't have to repeat the experiment more than twice. However with all this said I think that the experiment was truly successful and I was very pleased with the complete comparison of my results with my initial prediction. ...read more.

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